a) Draw the power flow diagram for a 3-phase induction motor. Induction motors work best as generators when operated in parallel with the power grid or a larger generator. Abstract. Here is what that looked like. I have done it that way before, but I would like to do better this time. The three-phase induction motor that for motor operation, the slip lies between zero and unity, and for this case we have a conversion of electrical energy into mechanical energy. If you have a three phase motor that has separate connections for the three windings it can be turned into a generator. I am no expert. The low horse power 3 phase motors that I have worked with have 3 wires to the winding's and a ground wire for the case. If you dis It works very well except load regulation sucks if av held constant for maintain 60hz frequency I using 5HP (which is 3.729kw) motor for Gen. To allow for inefficiencies I decide full load should be 2.5kw. The 1,000 factor is there to convert from W to kW; we want the resulting power to be in kilowatts. Y'all are missing the point! If you have a three phase motor that has separate connections for the three windings it can be turned into a generator. You will need to supply a DC excitation voltage to one of the windings and a prime mover (engine) to the shaft. The other two windings in the motor will be your power output. The total power in a three-phase system is just the sum of the power of the three individual power values of each phase. The stock motor is a 3 HP Baldor. Set your small gasoline engine in place on one edge of your platform. Hi Nasir, You can try to use VFD or inverter to drive your submersible pump.The inverter input power supply is single phase 240V and it will convert to 3 phase output to your motor.But please consider your Inverter current (ampere) rating same rated or higher than motor FLA.Rule of thumb to sizing your inverter is > FLA x 2 = VFD current rating. Working Principle of Three-Phase Induction Motor. This is a 3 phase induction motor being used as a generator powered by a diesel engine burning WVO. Your motor will work but it will be far from an ideal generator. 20 hp 3 phase motor converted into a single phase generator In a single phase to three phase converter system, all three phases usually enter the cycle at 120 degrees. Be sure that there is no power flowing to any of the wires you will be working with. Wearing rubber high-voltage gloves and using rubber-handled tools is also critical. To convert 3-phase to single-phase power, you can use a phase converter. If the motor is run as a self exciting induction generator (SEIG) the capacitors can either be connected in a delta or c2c arrangement. Induction motors produce torque based on the DIFFERENCE between the rotor speed and synchronous speed. Induction motors are commonplace, you'll find them on tools, furnaces, blowersetc. Heres the simple formula we use to calculate power on a 1-phase AC circuit: P (kW) = I (Amps) V (Volts) 1,000. When a three-phase supply is given to the stator winding, the rotating magnetic field (RMF) induced in the stator circuit. 3-phase induction motor is an electromechanical energy conversion device which converts 3-phase input electrical power into output mechanical power. How to do it The trick is, treat the two phase machine the same as a 3 phase machine with a missing phase. b) Some imported equipment requires a supply of 1000 kW of 60 Hz power. It is possible to convert them into effective brushless low rpm alternators by installing permanent magnets in the armature. The grid excites the generator (supplys reactive current) and as long as the shaft is turning faster than synchronous speed, it will generate real power (WATTS) into the grid. You will find that it is easy to make a generator out of an induction motor. Two main parts of motor are rotor and stator. You would get better results with a 1 or 2 HP induction motor. Our local power supply is 50 Hz. I got this motor at my university. Yes. Motor converts electrical energy into mechanical energy while Generator uses mechanical energy and produces electrical energy. By rotating the Simply connecting a three phase induction motor to the mains and spinning its shaft faster, than its synchronous speed will cause it to When those windings cut flux lines, a current is induced that produces a rotating magnetic field. 1: Induction machine working as a generator. You need to swap any two of the phases. Take a photo before and after to be sure you did the swap as you intended. That is to say if you have a red This is easily done inside the terminal #4. You can see that negative voltages contribute to power because squaring a negative number yields a positive value. What do the 6 wires connect to within the motor? Once the three-phase induction motor started on a single-phase supply, it continuously runs on reduced capacity. Step 1: Analyse Motor. Re: Converting Three Phase Motor to a Generator. Yes. A synchronous motor can be run as a synchronous generator (alternator) without any problem. It can feed power to either an infinite bus or an Three phase asynchronous motor is most common used motor in the world. 3-phase induction motor consists of a stator and a rotor. For instance, in the case of a 3-phase generator, you would have 6 leads. Be sure to show all the loss mechanisms and powers at conversion points. 3-Phase Power Formula. If you are sure you havent done this, either at the input or output of the starter, or at the motor terminal box, then it may be that someone else has done this upstream. Step 3. Yes. Motor converts electrical energy into mechanical energy while Generator uses mechanical energy and produces electrical energy. By rotating the In an induction machine, the shaft, when motoring, turns at the speed of the induced field. You will need to supply a DC excitation voltage to one of the windings and a prime mover (engine) to the shaft. First you will have to disconnect the start windings and reconfigure them to be independent of the run winding so they can work as a dedicated exciter winding. The prime mover torque becomes opposite to electric torque. The main difference between single phase and three phase is constancy of delivery. I'll probably use it in Parallel-star. 03/13/2011 8:59 PM. Make sure you connect the neutral wire to the centre of the Y between the coils and the caps. This method is also known as the static phase converter method or phase-shifting method or rewinding method. 1 To convert 3-phase to single-phase power, you can use a phase converter. A three-phase generator can be converted to a single-phase one by altering the connection between its stator windings inside or outside the generator head. Do a Google search on "Induction generator". Run capacitors = 12-16F/HP. The two basic types are On-Line and Island. In a hydro generation site, where an induction motor is used as a generator, the standard procedure is to start the motor off the grid and let it come up to normal speed turning the turbine. This can be done by swapping any two of the incoming three-phase lines. It has very good efficiency and low manufacture and maintain costs. Maybe it is a 3-phase motor with dual-voltage windings. text: Induction generators Three phase squirrel cage induction motors can also be used as generators. Drill mounting holes and use four of your 1 1/2-inch bolts (with nuts and lock washers) to secure your gas engine to your platform. 2,867. P = V 2 /R. Here P is power in watts, V is voltage in volts and R is electrical resistance in units called ohms. Output at max speed, ~1.4kHz. Connect the capacitors in a Y (Star) (minus one phase) configuration in parallel with the coils. After that, the control system takes over and you are feeding the grid. However, when they complete the cycle of 360 degrees, each phase will have peaked twice voltage. After you have spotted the field windings you have to connect a 12v power source (lead-acid battery) with some. Yes, providing that its 3 phase synchronous motorA 3 phase synchronous motor and an alternator are basically one and the same To get 400 volts Today we will show you the forward and reverse wiring of the 2hp 3-phase inducton motor. Start capacitor = 50-100F/HP. To run from 220 / 230 V 3 phase, change the windings to delta. Answer (1 of 36): We know that induction motor behave as induction generator at super synchronous speed (speed greater than synchronous speed) . The stator winding is overlapped at 120 (electrically) to each other. There may be a wiring diagram on the motors nameplate, or inside its connection box. Along with the other answers here I will add that you can turn one into a self-contained AC motor generator set. Commonly called rotary phase conve Answer (1 of 3): Induction motors usually have fewer than 6 wires - both single-phase and 3-phase ones. Yes is the simple answer, but how it works depends upon the type of motor it is. Every electric motor is a generator. They all generate a (back emf Run two wires from the motor to the converter. And at synchronous speed it does not work as motor as well as generator. For an induction motor to work as an induction generator, it should be driven by a prime mover. The stator winding is connected to a three phase supply in which it supplies electrical energy. Then you open the wicker gates and start powering the turbine. An induction machine will behave as an induction generator when: S lip becomes negative due to this the rotor current and rotor emf attains negative value. Third option would be to run 240V single phase from the panel to a 5KW VFD converting the supply to 240V 3 phase 50 HZ then using the transformer change up the supply to 380V, 3phase 50HZ. An induction motor can be used as a generator, as long as it's given a small voltage to magnetise it. Here is the dataplate: The motor is 6-pole, 3-phase, with dual voltage Star windings. 3 phase engine driven generators will normally have a DC field. The speed of the rotating magnetic field is known as synchronous speed (NS). this would work but I would not be able to adjust the HZ to match the motor. I called my dad up (who used to be a mechanic) and asked to see if he had any extra alternators. Answer (1 of 6): If the motor is European design, 4kW or smaller, it it likely to be wound in star (Y) for operation from 380 / 400 V 3 phase 50Hz. The applied line voltage produces a rotating magnetic field whose lines of flux are cut by the squirrel cage rotor windings. What is a 3-Phase Induction Motor? A three phase induction motor is a type of AC induction motors which operates on three phase supply as compared to the single phase induction motor where single phase supply is needed to operate it. The motor was $5, I couldn't resist. I connect 9 lead 3 phase motor with capacitors for operate as generator. First off you need to understand the two types of "generators" (with AC, it's actually called an Alternator, generator refers to DC, but for simplicity lets just go with it for now). The net output or efficiency of the motor is reduced 2/3rd of its rated capacity. To convert into a generator, I only need to re-machine the rotor and put magnets on it. Phase Conversion in Generators: (1) Reconfiguring Coil Connection. Fourth option would be a rotary phase converter. For this to work the motor must either be connected to a grid supply or an arrangement of capacitors. I have experimented particularly this scenario so I can tell exactly what will happen if one phase goes dead. If one of the supply voltage is lost We have performed experiments installing surplus computer hard drive magnets into the armatures. The only way to change the direction of rotation of a 3-phase (induction) motor is to change the incoming phase sequence. This device can be wired to the motor you plan to run that requires single-phase power. You need one capacitor per coil. Only if its a synchronous motor. This will have a permanent magnet rotor or a wound rotor with slip rings so the rotor can be excited by an extern Rotor is usually made as squirrel-cage, and it is inserted in stators hole. Here The capacitor supplies a synthetic phase approximately midway 90 deg between the 180 deg single-phase power source terminals for starting. Step 2: Apply Power to the Field Windings. Alternator Conversion. Oct 19, 2014. Basically, we just multiply amp by volts. Note that this will impact only the device wired to it, not an entire outlet because it is not hardwired into your electrical system. Joined Nov 4, 2013. Induction generators are increasingly being used in nonconventional energy systems such as wind, micro/mini hydro, etc. Engine driven generators with dc fields are usually constructed as alternators, but Now let us discuss how we can achieve these conditions. The start capacitor should be 4 to 5 times than running capacitors to match the induction motor high starting current. Fig. Explanation: 1.